668198695 has 16 divisors (see below), whose sum is σ = 809481600. Its totient is φ = 529484800.

The previous prime is 668198693. The next prime is 668198717. The reversal of 668198695 is 596891866.

It is not a de Polignac number, because 668198695 - 2¹ = 668198693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668198693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320055 + ... + 322135.

It is an arithmetic number, because the mean of its divisors is an integer number (50592600).

Almost surely, 2^668198695 is an apocalyptic number.

668198695 is a deficient number, since it is larger than the sum of its proper divisors (141282905).

668198695 is a wasteful number, since it uses less digits than its factorization.

668198695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666.

The product of its digits is 5598720, while the sum is 58.

The square root of 668198695 is about 25849.5395510249. The cubic root of 668198695 is about 874.2491278039.

The spelling of 668198695 in words is "six hundred sixty-eight million, one hundred ninety-eight thousand, six hundred ninety-five".